建筑物内部电场强度分布特性数值模拟研究

摘要

为解决建筑物内部空间电场强度分布难以量化的问题，采用时域有限差分（FDTD）法，对以平面波为激励源，二阶Mur吸收边界条件的闭合规则建筑物、非规则加窗建筑物和含钢筋非规则加窗建筑物3种模型结构内部电场强度分布特性进行模拟，并通过FEKO软件对计算结果的有效性进行验证。结果表明：普通混凝土材质的建筑物对平面波电场几乎无屏蔽效能；吸波混凝土材质的建筑物对平面波电场的屏蔽效能也较为有限，且随激励源频率的增加，在建筑开窗区域附近的谐振性增强，屏蔽性减弱；通过对植入钢筋墙体建筑物采用细线FDTD法的场强分布计算，证明金属钢筋可提高建筑围护结构的屏蔽效能。%In order to solve the quantitative problem of the electric-field strength distribtion inside the building space,FDTD method is used to simulate the electric-field strength for three kinds of model structures,including closed and regular buildings,ir-regular buildings with windows and irregular buildings of reinforced concrete with windows under plane wave and boundary condi-tion of second-order Mur. Simulation results are vertified by FEKO software. Studies show that ordinary concrete building has no shielding effectiveness for electric-field of plane wave;shielding effectiveness of absorbing concrete material building is more limit-ed;frequent increase with the radiant source,resonance is enhanced close to window area and shielding effectiveness is lower. It tes-tifies that reinforcement can improve the sheilding effectiveness of the building envelope,by calculating the distribution of electric-field strength with thin wire FDTD method for wall of reinforced concrete.